dt-bindings: mfd: update the clock bindings for atmel-hlcdc

Adjust the clock-names property to clarify that either sys_clk or
lvds_pll_clk is expected along with the slow_clk and periph_clk.  This
alignment with the actual hardware requirements will enable accurate
device tree configuration for systems using the HLCDC IP, better guiding
developers and maintainers to correctly specify the clock configuration for
proper device operation.

Fixes: 981c1c5 ("dt-bindings: mfd: Add bindings for SAM9X75 LCD controller")
Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>

Author: Dharma Balasubiramani

Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt

@@ -11,14 +11,10 @@ Required properties:
    "microchip,sam9x75-xlcdc"
  - reg: base address and size of the HLCDC device registers.
  - clock-names: the name of the 3 clocks requested by the HLCDC device.
-   Should contain "periph_clk", "sys_clk" and "slow_clk".
+   Should contain "periph_clk", "sys_clk" or "lvds_pll_clk" and "slow_clk".
  - clocks: should contain the 3 clocks requested by the HLCDC device.
  - interrupts: should contain the description of the HLCDC interrupt line
 
-Optional properties:
- - clocks: should contain the LVDS PLL clock requested by the HLCDC device.
- - clock-names: must be "lvds_pll_clk" requested by the HLCDC device.
-
 The HLCDC IP exposes two subdevices:
  - a PWM chip: see ../pwm/atmel-hlcdc-pwm.txt
  - a Display Controller: see ../display/atmel/hlcdc-dc.txt